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Elekta Unity MR-linac commissioning: mechanical and dosimetry tests

We report the commissioning results of Elekta Unity for the dosimetric performance and mechanical quality assurance (QA), and propose additional commissioning procedures. Mechanical tests included multi-leaf collimator (MLC) positional accuracy, radiation isocenter diameter at the center and off-cen...

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Autores principales: Tsuneda, Masato, Abe, Kota, Fujita, Yukio, Ikeda, Yohei, Furuyama, Yoshinobu, Uno, Takashi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9855313/
http://dx.doi.org/10.1093/jrr/rrac072
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author Tsuneda, Masato
Abe, Kota
Fujita, Yukio
Ikeda, Yohei
Furuyama, Yoshinobu
Uno, Takashi
author_facet Tsuneda, Masato
Abe, Kota
Fujita, Yukio
Ikeda, Yohei
Furuyama, Yoshinobu
Uno, Takashi
author_sort Tsuneda, Masato
collection PubMed
description We report the commissioning results of Elekta Unity for the dosimetric performance and mechanical quality assurance (QA), and propose additional commissioning procedures. Mechanical tests included multi-leaf collimator (MLC) positional accuracy, radiation isocenter diameter at the center and off-center position, and coincidence between the magnetic resonance (MR) image center and radiation isocenter. Comparisons between the measurements and calculations of the simple irradiated field, intensity modulated radiation therapy (IMRT) commissioning, MLC output factor ratio, validation of independent dose calculation software and end-to-end testing were performed to evaluate dosimetric performance. The average values of the MLC positional accuracy for film- and imaging device-based analysis were −0.1 and 0.3 mm, respectively. The measured radiation isocenter size was 0.41 mm, and the off-center results were within 1 mm. The coincidence was −0.21, −1.19 and 0.49 mm along the x-, y- and z-axes, respectively. The calculated percent depth doses (PDD) and profiles agreed with the measurements. The results of independent dose calculation were within the action level recommended by American Associations of Physicist in Medicine. The gamma passing rate (GPR) for IMRT commissioning was 98.6 ± 0.9%, and end-to-end testing of adapted plans showed agreement within 2% between the measurement and calculation. We reported the results of mechanical and dosimetric performances of Elekta Unity, and proposed novel commissioning procedures. Our results should provide knowledge to the physics community for enhancing the QA programs.
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spelling pubmed-98553132023-01-23 Elekta Unity MR-linac commissioning: mechanical and dosimetry tests Tsuneda, Masato Abe, Kota Fujita, Yukio Ikeda, Yohei Furuyama, Yoshinobu Uno, Takashi J Radiat Res Regular paper We report the commissioning results of Elekta Unity for the dosimetric performance and mechanical quality assurance (QA), and propose additional commissioning procedures. Mechanical tests included multi-leaf collimator (MLC) positional accuracy, radiation isocenter diameter at the center and off-center position, and coincidence between the magnetic resonance (MR) image center and radiation isocenter. Comparisons between the measurements and calculations of the simple irradiated field, intensity modulated radiation therapy (IMRT) commissioning, MLC output factor ratio, validation of independent dose calculation software and end-to-end testing were performed to evaluate dosimetric performance. The average values of the MLC positional accuracy for film- and imaging device-based analysis were −0.1 and 0.3 mm, respectively. The measured radiation isocenter size was 0.41 mm, and the off-center results were within 1 mm. The coincidence was −0.21, −1.19 and 0.49 mm along the x-, y- and z-axes, respectively. The calculated percent depth doses (PDD) and profiles agreed with the measurements. The results of independent dose calculation were within the action level recommended by American Associations of Physicist in Medicine. The gamma passing rate (GPR) for IMRT commissioning was 98.6 ± 0.9%, and end-to-end testing of adapted plans showed agreement within 2% between the measurement and calculation. We reported the results of mechanical and dosimetric performances of Elekta Unity, and proposed novel commissioning procedures. Our results should provide knowledge to the physics community for enhancing the QA programs. Oxford University Press 2022-11-14 /pmc/articles/PMC9855313/ http://dx.doi.org/10.1093/jrr/rrac072 Text en © The Author(s) 2022. Published by Oxford University Press on behalf of The Japanese Radiation Research Society and Japanese Society for Radiation Oncology. https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Regular paper
Tsuneda, Masato
Abe, Kota
Fujita, Yukio
Ikeda, Yohei
Furuyama, Yoshinobu
Uno, Takashi
Elekta Unity MR-linac commissioning: mechanical and dosimetry tests
title Elekta Unity MR-linac commissioning: mechanical and dosimetry tests
title_full Elekta Unity MR-linac commissioning: mechanical and dosimetry tests
title_fullStr Elekta Unity MR-linac commissioning: mechanical and dosimetry tests
title_full_unstemmed Elekta Unity MR-linac commissioning: mechanical and dosimetry tests
title_short Elekta Unity MR-linac commissioning: mechanical and dosimetry tests
title_sort elekta unity mr-linac commissioning: mechanical and dosimetry tests
topic Regular paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9855313/
http://dx.doi.org/10.1093/jrr/rrac072
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